Numerical simulation of liquid steel flow and behaviour of non-metallic inclusions in one-strand slab tundish with subflux turbulence controller and gas permeable barrier

Abstract

Numerical simulation of liquid steel flow and behaviour of non-metallic inclusions in onestrand slab tundish with subflux turbulence controller and gas permeable barrier A. Cwudziń ski* The paper presents computation results from the simulation of liquid steel flow in a one-strand slab tundish used in a Polish steel plant. This is a wedge type tundish with a depression in the bottom of the discharge zone. Fluent software was used for solving the mathematical model of the casting process, and Euler-Lagrange description was chosen for the description of interactions between the continuous phase (liquid steel) and the discrete phase (inert gas). To verify the mathematical model and the numerical simulation results, test results obtained from industrial experiments were applied. The internal geometry of the facility under consideration was changed by two types of flow control devices, a subflux turbulence controller and a gas permeable barrier mounted on the tundish bottom. A number of variants were tested including flowrate and position of the argon. For all variants of modification, the quantity of non-metallic inclusions removed from liquid steel has been obtained.

Micro-bubble Formation under Non-wetting Conditions in a Full-scale Water Model of a Ladle Shroud/Tundish System

“…To reduce bubbles size in water systems, some researchers [8][9][10] have investigated injecting gas through the ladle shroud, rather than attempting to make small bubbles using the conventional gas curtain technique. 11) In the ladle shroud approach, gas is injected through small orifices on the inner wall of ladle shroud. There, bubbles were formed under the shearing action of the inertial flow of…”

Numerical Modelling of Non-Metallic Inclusions Size Distribution During Liquid Steel Flow Through a Continuous Casting Slab Tundish

“…The facility covered by the evaluation of NMI behaviour is a wedge-type tundish designed for the casting of concast slab, as described in detail in the paper [11]. The liquid steel from the main ladle flows into the tundish through the ladle shroud.…”

“…The collision kernel was represented by the turbulent collision model, in which Hamaker's constant was 2.3e-20, as described by the following equations [13]: It was assumed that the non-metallic phase was represented by NMIs of the Al 2 O 3 type of a density of 3960 kg/m 3 . The remaining physicochemical quantities describing the both phases are reported in work [11]. The steel flow rate was 34.17 kg/s, which corresponded to the founding sequence of casting 1500×225 mm concast slabs at a speed of 0.9 m/min.…”

Chemical Homogenization Of Liquid Steel Flowed Through Continuous Casting Slab Tundish During Alloying Process

“…The continuous liquid steel movement in the tundish working space is intensified by the feeding stream. The process of steel mixing within the tundish working space can be additionally modified by flow control devices, such as a dam, a weir, a subflux turbulence controller or a gas-permeable barrier [9][10][11][12]. In view of the above, the specific time of liquid steel residence in the tundish and the feeding stream mixing energy create a possibility of effective introducing alloy additions to liquid steel during continuous casting, with the 95% level of chemical homogenization being achieved.…”